Filter for pneumatic carpet-cleaners.



L. L. FERGUSON. FILTER FOR PNBUMTIG CARPET CLEANERS.

APPLICATION I'ILED JUNE 8, 1914.

Patented Aug. 18, 1914.

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LEONARD L. FERGUSON, OF CHICAGO, ILLINOIS, ASSIG-NOR `IO JOHN W. DUNTLEY, OF CHICAGO, ILLINOIS.

FILTER FOR PNEUMATIC CARPET-CLEANERS.

Application filed June 8, 1.914. Serial No. 843,751. y

To all whom t may concern lie it known that I, LEONARD L. FEnoUsov,l

a citizen of the `United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Filters for Pneumatic Carpet-Cleaners, of which the following` is a specification.

The main objects of this invention are to provide an improved filtering device for pneumatic carpet cleaners having a filter separably mounted on the structure or frame for the purpose of facilitating the cleaning' and renewal thereof.

An illustrative embodiment` of this invention is shown in the accompanying drawings, in whichi Figure 1 a plan view of a filter constructed according tothis invention. Fig. 2 is a longitudinal sectional view of the same.

The device shown in the drawings com` prises a sheet metal frame 1, having a strengthening' bead 2 formed therein to resist either lengthwise or crcsswise bending strains. A circular opening 3 is cut in frame 1 and the metal at the edges of said opening is bent backwardly upon itself at 11. Slots 5 are cut in the bent portions e to provide a passage for tongues 6 of a ring-shaped sheet metal retaining device 7. The inner edges of frame 1 after beingv bent inwardly are again bent outwardly at 8 to provide an annular recess 9 for receiving tongue 6 of the r-etaining'device 7. The metal is then bent downwardly at 10 and then inwardly at 11 to provide a seat for a detachable filtering device 12.

The detachable filtering `device comprises a ringeshaped frame 13 preferably punched out of cardboard and on one face of which is mounted a filtering fabric 14. Between the frame 13 and the retaining ring 7 is a circular metallic screen 15 preferably detach` able from the remainder of the device when the retaining ring 7 is removed.

In assembling the structure, the frame 13 and the tiltering fabric thereon is placed within the seat formed by the downwardly and inwardly bent edge of frame 1. The metallic screen 15 is then placed on the frame 13 and finally the retaining ring 7 is placed in position by passing its tongues 6 through slots 5 into the recess 9. The ring or plate 7 is then slightly rotated in there- Specification of Letters Patent.

'assemble the new filter with Patented Aug. y18 1914.

cess for the purpose of retaining the parts of the device in assembled condition.

In the operation of the device, thc current of air to be filtered passes upwardly through the opening 3 and is filtered by the fabric la. The metallic screen 15 serves the usual function of limiting the upward bowing of the filtering fabric under the action of the current of air, and also prevents the fabric from closing ports in pumping apparatus which is usually located immediately7 above the. filtering device. u

It may be seen that in the device above described, when renewal of the filtering fab` ric is required, the latter may be supplied without requiring transmission of the entire filter structure to and from the manufac` turer, but the cardboard ring 13 and filtering fabric 14 maybe sent to the user through the mails and the latter may also quickly frame 1.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim 1. In a device of the class described, the combination of a sheet metal frame having a circular opening therein, the edges of said opening being bent backwardly upon themselves and then inwardly to form an annular recess and then bent downwardly and inwardly to form a seat, a filtering device in said seat, and retaining means for said filtering device removably supported in said annular recess.

2. In a device of the class described, the combination of a sheet metal frame having a circular opening, the edge of said opening being bent backwardly upon itself and then inwardly to provide an annular recess and then downwardly and inwardly to provide a seat, the backwardly bent portion of said edgebeing slotted, a filtering device in said seat, and an annular sheet metal locking device having tongues adapted to pass through said slo-ts and into said recess for the purpose of retaining the filtering device in said frame.

3. In a device of the class described, the combination of a sheet metal frame having a circular opening, the edge of Seial opening being bent buclm'zn'dly upon iiselt' :unl then inwardly te provide un annular recess and then dowmvnrlly and in wnrdly te previde n Sent, the buckwarrlly bent portion ei said edge being slotted, u filtering device in said Seat, und an annular Shect metal locking (levice having' tongues adapted to pass through said Slots und into Suid recess for the purpose of retaining the filtering device in said l lrnlne, Said filtering device comprising a .supporting ring and fabric mounted thereon. Signed at Chlcagn this 16th clay o- Muy LEONARD L. FERGUSON. lVitnesses RUDOW RUMMLER, M. 'IRENE HUTGHINGS.

yCofes f this liateixt my be obtind for i've cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

